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1996 Pontiac Grand Am Failed smog test

Tiny
WEASEL225
  • MEMBER
  • 1996 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 111,000 MILES
I have no engine codes. Test results as follows

15mph CO2 14.8 O2.2 HC max 56 ave 9 Meas 97 CO max.51 ave.02 Meas.33 NO max 443 ave 57 Meas 1147

25mph CO2 14.8 O2.2 HC max 40 ave 7 meas 87 CO max.49 ave.03 meas.35 NO max 730 ave 50 meas 6059

Does this sound like an egr or a Cat Converter?
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Tuesday, April 20th, 2010 AT 8:04 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Honestly, either could cause it along with other problems. Has the check engine light come on?
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Tuesday, April 20th, 2010 AT 10:06 PM
Tiny
WEASEL225
  • MEMBER
  • 4 POSTS
I previously had a 0335 and a 0300 code and replaced the crank sensor and the coil tower which seems to have the engine running very smooth and strong. My gut feeling is that the Cat was probably damaged before I got this car from bad ignition (0300) and dumped a lot of fuel into the Cat and subsequently burned it out.
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Wednesday, April 21st, 2010 AT 1:18 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
That is very possible. Have you checked it?
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Wednesday, April 21st, 2010 AT 8:09 AM
Tiny
WEASEL225
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  • 4 POSTS
Having it checked today hopefully.
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Wednesday, April 21st, 2010 AT 11:17 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Let me know what you find. I am anxious to see it that is the problem.
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Wednesday, April 21st, 2010 AT 1:43 PM
Tiny
WEASEL225
  • MEMBER
  • 4 POSTS
Replaced the Cat and ran it for about 1 hour to burn in the new one and reset code from battery disconnect and it passed with flying colors. Old was almost completely plugged and had taken fuel damage.

Thanks for the help!
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Wednesday, April 21st, 2010 AT 3:59 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Great! I'm glad you found the problem. Let us know if you have questions in the future.

Joe
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Thursday, April 22nd, 2010 AT 7:52 AM

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